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Avoiding calling queries when collecting active queries #138672
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☔ The latest upstream changes (presumably #122156) made this pull request unmergeable. Please resolve the merge conflicts. |
r? oli-obk or fee1-dead? |
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Labels
A-query-system
Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)
S-waiting-on-review
Status: Awaiting review from the assignee but also interested parties.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
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This PR changes active query collection to no longer call queries. Instead the fields needing queries have their computation delayed to when an cycle error is emitted or when printing the query backtrace in a panic.
This is done by splitting the fields in
QueryStackFrame
needing queries into a newQueryStackFrameExtra
type. When collecting queriesQueryStackFrame
will contain a closure that can createQueryStackFrameExtra
, which does make use of queries. Callinglift
on aQueryStackFrame
orCycleError
will convert it to a variant containingQueryStackFrameExtra
using those closures.This also only calls queries needed to collect information on a cycle errors, instead of information on all active queries.
Calling queries when collecting active queries is a bit odd. Calling queries should not be done in the deadlock handler at all.
This avoids the out of memory scenario in #124901.
This is based on #138581.